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Re: Volume Knob does not adjust volume, but remote does.
Check your owners manual for "factory reset" this will reset the main micro-processor. Otherwise the encoder (volume pot) needs cleaning, soldering or replacement. It could also be a cracked circuit board (if it has recently been hit)
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Dirty rotary encoder (volume control ). If you are confident with opening the unit yourself, a spray of contact cleaner into the encoder might help. Ideally u should replace it.
The volume minus button on your remote is dirty/shorted. Try removing remote control batteries and see if the issue disappears.
First solution would be to try and use the remote. If the remote is able to, the problem is in the knob. If the remote does not work, the problem resides in the volume board.
The problem resides in the circuitry that the knob is controlling. Unfortunately this knob has a full range of motion, which means that it is simply controlling a computer chip within the unit. (i have an 1801 as well). What has happened is that some component on the volume board has gone bad, which is resulting in your non functioning volume knob.
Unfortunately this is usually a job for a professional.
If you have standard electronics skills (soldering / disassemble / reassemble), you can open the case and find where the volume knob leads to. There should be a smaller board, and see if you can access it. Usually they are rather hard to get to, or to get free to actually see what is going on. The best solution would be to find a parts receiver, and swap boards. This shotgun approach changes everything. Otherwise, look for any damaged components on the board. Swap out any components that are damaged, or appear damaged with comparable replacements.
If the Volume goes up with the remote controller then the fault is the failure of the stepper motor on the volume controller knob unit. The digital output must be converted through the D/A converter to a motor driver to show the indication of volume .
However if there is no change with the remote then the processor output and the converter section must be traced to find the loss of signal- possible failure of a digital gate.
if you know how to repair, then replace the volume control switch. it is a digital type/mechanical type of switch with silicone oil on it to prevent sudden turn of volume. if i were the repairman i can simply clean the contacts of the volume control and pour silicon oil again. but i really dont know in your area if they try to clean those.